Falcon 9 has already proven that partial reusability is economical. SpaceX has dominated the entire worldwide launch industry and their competitors are nation

Falcon 9 has already proven that partial reusability is economical. SpaceX has dominated the entire worldwide launch industry and their competitors are nation states with no need to make a profit. The difference is that they have already proven to be the lowest cost and most reliable launcher due to reuse. This is them lapping the industry with second stage reusability.